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Sep 19, 2013
09/13

by
V. V. Kiselev

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We calculate the leptonic constant for the ground pseudoscalar state of B_c meson in the framework of QCD-motivated potential model taking into account the two-loop anomalous dimension for the heavy quark current in the nonrelativistic QCD as matched with the full QCD.

Source: http://arxiv.org/abs/hep-ph/0304017v3

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Jul 20, 2013
07/13

by
V. V. Kiselev

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An effective action of ghost condensate with higher derivatives creates a source of gravity and mimics a dark matter in spiral galaxies. We present a spherically symmetric static solution of Einstein--Hilbert equations with the ghost condensate at large distances, where flat rotation curves are reproduced in leading order over small ratio of two energy scales characterizing constant temporal and spatial derivatives of ghost field: mu_*^2 and mu_\star^2, respectively, with a hierarchy...

Source: http://arxiv.org/abs/gr-qc/0406086v2

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Sep 19, 2013
09/13

by
V. V. Kiselev

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The characteristic scale of neutral current, provided by an extension of Standard Model with a local group over the right-handed fermions, determines the smallness of neutrino masses of Dirac kind. The experimental observation of neutrino oscillations imposes the stringent limit on the $Z^\prime$ physics appearance at low energies.

Source: http://arxiv.org/abs/hep-ph/9812356v1

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Sep 20, 2013
09/13

by
V. V. Kiselev

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The value of $\alpha_s(m_Z)=0.106\pm 0.005$ is obtained in a scheme of sum rules for the leptonic constants of the vector $nS$-levels in the heavy $(\bar b b)$-quarkonium.

Source: http://arxiv.org/abs/hep-ph/9610482v1

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Sep 20, 2013
09/13

by
V. V. Kiselev

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We establish a state of stopping the Hawking radiation by quantum Schwarzschild black hole in the framework of quasi-classical thermal quantization for particles behind the horizon. The mechanism of absorption and radiation by the black hole is presented.

Source: http://arxiv.org/abs/gr-qc/0506006v1

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Sep 19, 2013
09/13

by
V. V. Kiselev

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An effective action of ghost condensate with higher derivatives creates a source of gravity and mimics a dark matter in spiral galaxies. We present a spherically symmetric static solution of Einstein--Hilbert equations with the ghost condensate at large distances, where flat rotation curves are reproduced in leading order over small ratio of two energy scales characterizing constant temporal and spatial derivatives of ghost field: $\mu_*^2$ and $\mu_\star^2$, respectively, with a hierarchy...

Source: http://arxiv.org/abs/gr-qc/0507126v1

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Sep 23, 2013
09/13

by
V. V. Kiselev

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We present a review of general picture in the sector of electroweak symmetry breaking with the CP-violation in the heavy quark interactions.

Source: http://arxiv.org/abs/hep-ph/0109089v1

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Sep 23, 2013
09/13

by
V. V. Kiselev

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Introducing a source for a bi-local composite operator motivated by the perturbative expansion in gauge couplings, we calculate its effective potential in the renormalization group of Standard Model with no involvement of technicolor. The potential indicates the breaking of electroweak symmetry below a scale M due to a nonzero vacuum expectation value of neutral component for the SU(2)-doublet operator. At virtualities below a cut off \Lambda we introduce the local higgs approximation for the...

Source: http://arxiv.org/abs/hep-ph/9909545v5

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Sep 22, 2013
09/13

by
V. V. Kiselev

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Using a quite accurate flavour-independence of $nS$-level mass differences in heavy quarkonia and a corresponding quasiclassical expression for the heavy quark binding energy, one shows that experimental data on masses of mesons with heavy quarks allow one to make the estimate $\bar \Lambda= 0.63\pm 0.03$ GeV.

Source: http://arxiv.org/abs/hep-ph/9602361v1

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Sep 20, 2013
09/13

by
V. V. Kiselev

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In the framework of thermal quantization of radial geodesics completely confined behind the horizons we calculate the entropy of BTZ black hole in agreement with the Bekenstein--Hawking relation. Particles in the BTZ black hole occupy the only quantum ground level. The quantization allow us to find a linear dependence of black hole mass versus its orbital momentum.

Source: http://arxiv.org/abs/gr-qc/0506053v1

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Sep 21, 2013
09/13

by
V. V. Kiselev

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A modified gravity involving a critical acceleration, as empirically established at galactic scales and successfully tested by data on supernovae of type Ia, can fit the measured multipole spectrum of anisotropy in the cosmic microwave background radiation, so that a dark sector of Universe is constructively mimicked as caused by the dynamics beyond the general relativity. Physical consequences, verifiable predictions and falsifiable issues are listed and discussed.

Source: http://arxiv.org/abs/1204.0869v2

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Sep 22, 2013
09/13

by
V. V. Kiselev

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In the framework of sum rules with a use of quarkonium mass spectrum, evaluated in the quasiclassical approximation, estimates of leptonic constant $f_B^{stat}\simeq 320\pm 60$ MeV in a static limit and for the average heavy quark momentum squared $\mu_\pi^2 \simeq 0.5\pm 0.1$ GeV$^2$ are obtained.

Source: http://arxiv.org/abs/hep-ph/9602360v1

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Sep 22, 2013
09/13

by
V. V. Kiselev

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In the framework of simple assumption on factorizing a mixing of vector state with isoscalar components in effective amplitudes of isospin breaking caused by the electromagnetic quark current, a branching fraction of radiative $J/\psi\to a_0$ transition is evaluated at the level of $3\cdot 10^{-3}$.

Source: http://arxiv.org/abs/hep-ph/0702062v2

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Jul 19, 2013
07/13

by
V. V. Kiselev

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Sum rules for exclusive production of heavy meson pairs in $e^+e^-$ annihilation are used to evaluate the $\Upsilon(4S) \to B \bar B$ and $\psi(3770) \to D \bar D$ decay widths. Infinitely heavy quark limit is discussed, so that scaling law for the quarkonium-meson coupling constant is derived. A value of the $B\bar B$ pair contribution into the leptonic constant $f_{\Upsilon(4S)}$ is estimated.

Source: http://arxiv.org/abs/hep-ph/9401339v1

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Sep 21, 2013
09/13

by
V. V. Kiselev

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We derive generic equations for a vector field driving the evolution of flat homogeneous isotropic universe and give a comparison with a scalar filed dynamics in the cosmology. Two exact solutions are shown as examples, which can serve to describe an inflation and a slow falling down of dynamical ``cosmological constant'' like it is given by the scalar quintessence. An attractive feature of vector field description is a generation of ``induced mass'' proportional to a Hubble constant, which...

Source: http://arxiv.org/abs/gr-qc/0402095v4

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Sep 23, 2013
09/13

by
V. V. Kiselev

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In the framework of QCD sum rules one uses a scheme, allowing one to apply the conditions of both nonrelativistic heavy quark motion inside mesons and independence of nonsplitting nS-state density on the heavy quark flavours. In the leading order an analitic expression is derived for leptonic constants of both heavy quarkonia and heavy mesons with a single heavy quark. The expression allows one explicitly to determine scaling properties of the constants.

Source: http://arxiv.org/abs/hep-ph/9406243v1

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Sep 18, 2013
09/13

by
V. V. Kiselev

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We present new static spherically-symmetric exact solutions of Einstein equations with the quintessential matter surrounding a black hole charged or not as well as for the case without the black hole. A condition of additivity and linearity in the energy-momentum tensor is introduced, which allows one to get correct limits to the known solutions for the electromagnetic static field implying the relativistic relation between the energy density and pressure, as well as for the extraordinary case...

Source: http://arxiv.org/abs/gr-qc/0210040v3

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Sep 21, 2013
09/13

by
V. V. Kiselev

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We construct a Lagrangian of Weyl spinors and gauge fields, which is invariant under the action of equivalent local transformations on the spinor algebra representations. A model of vacuum with a nontrivial gauge strength-tensor setting a scale and spontaneously breaking the gauge symmetry is suggested, so that the leading approximation at low energies is described by the Einstein--Hilbert Lagrangian of gravity. We consider a mechanism for the cancellation of cosmological constant due to a...

Source: http://arxiv.org/abs/hep-ph/0104222v4

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Sep 24, 2013
09/13

by
V. V. Kiselev

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We specify an angular motion on geodesics to reduce the problem to the case of radial motion elaborated in previous chapters. An appropriate value of entropy for a charged and rotating black hole is obtained by calculating the partition function on thermal geodesics confined under horizons. The quantum aggregation is classified in a similar way to the Reissner--Nordstrom black hole.

Source: http://arxiv.org/abs/gr-qc/0412110v3

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Sep 20, 2013
09/13

by
V. V. Kiselev

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We study equations of a non-gauge vector field in a spherically symmetric static metric. The constant vector field with a scale arrangement of components: the time component about the Planck mass m_{Pl} and the radial component about M suppressed with respect to the Planck mass, serves as a source of metric reproducing flat rotation curves in dark halos of spiral galaxies, so that the velocity of rotation v_0 is determined by the hierarchy of scales: \sqrt{2} v_0^2= M/m_{Pl}, and M\sim 10^{12}...

Source: http://arxiv.org/abs/gr-qc/0404042v3

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Jul 20, 2013
07/13

by
V. V. Kiselev

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Using a specific scheme of the QCD sum rules, one derives the relation for leptonic constants of $nS$-wave heavy qiarkonia, so $f^2_{n_1}/f^2_{n_2}= n_2/n_1$, that does not depend on the quarkonium content, and it is in a good agreement with the experimental values of constants for the $\psi$- and $\Upsilon$-families.

Source: http://arxiv.org/abs/hep-ph/9407375v1

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Sep 22, 2013
09/13

by
V. V. Kiselev

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We consider the dynamics of tensor and scalar gravitational fields in the Relativistic Theory of Gravitation with the Minkowskian vacuum metric and generalize the formulation to the massless graviton. The potential of scalar field is determined in the presence of cosmological term under clear physical motivations. We find cosmological inflationary solutions and analyze conditions providing the transition to the regime of hot expanding universe.

Source: http://arxiv.org/abs/hep-ph/0106003v4

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Sep 18, 2013
09/13

by
V. V. Kiselev

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The fragmentation function of a scalar leptoquark into possible S-wave bound states with a heavy anti-quark is calculated to the leading order in perturbative QCD for the high energy processes at large transverse momenta. The one-loop equations for the $q^2$-evolution of moments of the fragmentation function due to the hard gluon emission by the leptoquark are derived. The integral probabilities of fragmentation are evaluated.

Source: http://arxiv.org/abs/hep-ph/9710432v1

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Sep 22, 2013
09/13

by
V. V. Kiselev

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In the model with the spontaneous breaking of chiral gauge symmetry, the vacuum structure for the pair of Higgs fields can provide the introduction of two generations of fermions. The mixing matrix of charged currents is determined.

Source: http://arxiv.org/abs/hep-ph/9708203v4

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Sep 19, 2013
09/13

by
V. V. Kiselev

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We calculate the contribution of local gluon condensate into the quadratic theta-term of vacuum energy and discuss its application to the study of axion mass.

Source: http://arxiv.org/abs/hep-ph/0304062v2

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Sep 23, 2013
09/13

by
V. V. Kiselev

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A model is constructed for a chiral abelian gauge-interaction of fermions and a potential of three higgses, so that the potential possesses a discrete symmetry of the vacuum state, which provides the introduction of three generations for the fermions. For the model including charged currents, a matrix of the flavor mixing is described, and a phase giving the violation of CP-invariance is determined. Some approximate relations connecting the values of mixing matrix to the mass ratios for the...

Source: http://arxiv.org/abs/hep-ph/9806523v4

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Sep 18, 2013
09/13

by
V. V. Kiselev

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The two-particle decays of B_c^+ to psi pi^+(rho^+) and B_c^+ to eta_c pi^+(rho^+) are considered in a way taking into account a soft binding of quarks in the heavy quarkonia and a hard gluon exchange between the constituents at large recoil momenta of psi(eta_c). An approximate double enhancement of the amplitudes is found because of the nonspectator t-channel contribution.

Source: http://arxiv.org/abs/hep-ph/9605451v3

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Jul 20, 2013
07/13

by
V. V. Kiselev

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Using a specific scheme of the QCD sum rules, one derives an universal formula for the mass differences for the $nS$-levels of heavy qiarkonium. This relation does not depend on the flavours of the heavy quarks, composing the quarkonium, and it is in a good agreement with the experimental mass values for the $\psi$- and $\Upsilon$-families.

Source: http://arxiv.org/abs/hep-ph/9407373v1

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Sep 19, 2013
09/13

by
V. V. Kiselev

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On the base of an exact solution for the static spherically symmetric Einstein equations with the quintessential dark matter, we explain the asymptotic behavior of rotation curves in spiral galaxies. The parameter of the quintessence state, i.e. the ratio of its pressure to the density is tending to -1/3. We present an opportunity to imitate the relevant quintessence by appropriate scalar fields in the space-time with extra 2 dimensions.

Source: http://arxiv.org/abs/gr-qc/0303031v3

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Sep 22, 2013
09/13

by
V. V. Kiselev

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Exotic states in the charmonium family are systematically treated in the framework of simplest model with an effective coulomb-like interaction of heavy quark and antiquark in the presence of static excitation of quark-gluon modes responsible for a nonperturbative term of potential, which provides with the confinement of quarks, in terms of bag over the threshold in the excitation spectrum of vacuum fields. Once the spectrum has got quite a wide mass gap, it allows us to approximate the bag...

Source: http://arxiv.org/abs/0805.4329v2

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Sep 23, 2013
09/13

by
V. V. Kiselev

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The decay constant for the vector state of $3S$-level in the heavy $(\bar b c)$-quarkonium is evaluated in the framework of sum rules for the mesonic currents. A scaling relation for the constants of vector quarkonia with different quark contents is derived. The numerical estime gives $\Gamma(B_c^{*+}(3S)\to B^+D^0)=90 \pm 35$ MeV.

Source: http://arxiv.org/abs/hep-ph/9608435v1

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Sep 22, 2013
09/13

by
V. V. Kiselev

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The modification of the naive potential model of the heavy meson is considered on the basis of the single-time prescription for the quark-meson form factor and the covariant choice of the quatk relative momentum. The application of the model to the description of the semileptonic decays of the beauty meson allows one to determine the Isgur-Wise function slope $\rho^2\simeq 1.25$ and to extract the value $|V_{bc}|= 0.038\pm 0.003$ from the experimental data.

Source: http://arxiv.org/abs/hep-ph/9409348v1

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Sep 18, 2013
09/13

by
V. V. Kiselev

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The black hole as the thermodynamical system in equilibrium possesses the periodicity of motion in imaginary time, that allows us to formulate the quasi-classical rule of quantization. The rule yields the equidistant spectrum for the entropy of non-rotating black holes as well as for the appropriately scaled entropy in the case of rotation. We clarify and discuss a role of quasi-normal modes.

Source: http://arxiv.org/abs/gr-qc/0509038v3

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Sep 18, 2013
09/13

by
V. V. Kiselev

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For evolution of flat universe, we classify late time and future attractors with scaling behavior of scalar field quintessence in the case of potential, which, at definite values of its parameters and initial data, corresponds to exact scaling in the presence of cosmological constant.

Source: http://arxiv.org/abs/gr-qc/0611064v3

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Sep 19, 2013
09/13

by
V. V. Kiselev

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The model-independent method based on the triangle ideology is implemented to extract the CKM-matrix angle gamma in the decays of doubly heavy long-lived meson B_c. We analyze a color structure of diagrams and conditions to reconstruct two reference-triangles by tagging the flavor and CP eigenstates of D^0 meson in the fixed exclusive channels. The characteristic branching ratios are evaluated in the framework of QCD sum rules.

Source: http://arxiv.org/abs/hep-ph/0302241v1

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Jul 20, 2013
07/13

by
V. V. Kiselev

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In the framework of a specific scheme of the QCD sum rules for $S$-wave levels of the heavy quarkonium, one derives an expression, relating the energetic density of quarkonium states and universal characteristics in the heavy quarkonium physics, such as the difference between the masses of a heavy quark $Q$ and meson $(Q\bar q)$ and the number of heavy quarkonium levels below the threshold of $(Q\bar Q) \to (Q\bar q) + (\bar Q q)$ decay.

Source: http://arxiv.org/abs/hep-ph/9407371v1

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Sep 24, 2013
09/13

by
V. V. Kiselev

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Causal radial geodesics with a positive interval in the Schwarzschild metric include a subset of trajectories completely confined under a horizon, which compose a thermal statistical ensemble with the Hawking-Gibbons temperature. The Bekenstein--Hawking entropy is given by an action at corresponding geodesics of particles with a summed mass equal to that of black hole in the limit of large mass.

Source: http://arxiv.org/abs/gr-qc/0412090v3

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Sep 22, 2013
09/13

by
V. V. Kiselev

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We summarize theoretical predictions on the decays of B_c meson.

Source: http://arxiv.org/abs/hep-ph/0308214v1

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Sep 24, 2013
09/13

by
V. V. Kiselev

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Using thermal quantization of geodesics confined under horizons and reasonable conjecture on massless modes, we evaluate quantum spectrum of Kerr black hole masses compatible with superstring symmetries.

Source: http://arxiv.org/abs/gr-qc/0412117v3

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Sep 22, 2013
09/13

by
V. V. Kiselev

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In a specific scheme of the QCD sum rules, one gives the estimate of $\alpha_S\simeq 0.20$ from the data on the masses and leptonic constants of $\psi$- and $\Upsilon$-particles.

Source: http://arxiv.org/abs/hep-ph/9409288v1

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Sep 24, 2013
09/13

by
V. V. Kiselev

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The entropy of charged black hole is calculated by using the partition function evaluated at radial geodesics confined under horizons. We establish two quantum phase states inside the black hole and a transition between them.

Source: http://arxiv.org/abs/gr-qc/0412097v2

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Sep 21, 2013
09/13

by
V. V. Kiselev

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We investigate a connection between a renormalon ambiguity of heavy quark mass and the gluon condensate contribution into the quark dispersion law related with a virtuality defining a displacement of the heavy quark from the perturbative mass-shell, which happens inside a hadron.

Source: http://arxiv.org/abs/hep-ph/9907407v4

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Sep 22, 2013
09/13

by
V. V. Kiselev

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Using a specific scheme of the QCD sum rules for heavy quarkonium in the leading approximation over the inverse heavy quark mass, one gets the estimate of the difference between the masses of the heavy meson and heavy quark $\bar \Lambda = 0.59\pm 0.02$ GeV.

Source: http://arxiv.org/abs/hep-ph/9409256v2

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Sep 17, 2013
09/13

by
V. V. Kiselev

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We show that the Einstein-Hilbert action for the gravitational field can be obtained as a linear low-energy approximation for the dynamical massless fields in the theory with the lagrangian quadratic in the gauge field strength-tensor of spin connection under the spontaneous breaking of symmetry with a vacuum state described by an ansatz for nontrivial background strength-tension.

Source: http://arxiv.org/abs/hep-ph/0207088v2

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Sep 22, 2013
09/13

by
V. V. Kiselev; S. A. Timofeev

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We argue for a model of low-energy correction to the inflationary potential as caused by the gauge-mediated breaking down the supersymmetry at the scale of $\mu_\textsc{x}\sim 10^4$ GeV, that provides us with the seesaw mechanism of thin domain wall fluctuations in the flat vacuum. The fluctuations are responsible for the vacuum with the cosmological constant at the scale of $\mu_\Lambda\sim 10^{-2}$ eV suppressed by the Planckian mass $m_\mathtt{Pl}$ via...

Source: http://arxiv.org/abs/1004.4112v2

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Sep 23, 2013
09/13

by
V. V. Kiselev; S. A. Timofeev

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The cosmological constant is inherently determined by the scale of breaking down supersymmetry in the mechanism of seesaw fluctuations of two vacuum-states.

Source: http://arxiv.org/abs/0710.1685v2

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Sep 21, 2013
09/13

by
V. V. Kiselev; S. A. Timofeev

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Regime of MOND, which is used in astronomy to describe the gravitating systems of island type without the need to postulate the existence of a hypothetical dark matter, is generalized to the case of homogeneous distribution of usual matter by introducing a linear dependence of the critical acceleration on the size of region under consideration. We show that such the extrapolation of MOND in cosmology is consistent with both the observed dependence of brightness on the redshift for type Ia...

Source: http://arxiv.org/abs/1104.3654v3

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Sep 22, 2013
09/13

by
V. V. Kiselev; S. A. Timofeev

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The Higgs boson of Standard Model, minimally coupled to the gravitation, is not able to produce the inflation of early Universe if its mass exceeds the threshold value, which is equal to m_H^{min} = 142 GeV in the tree approximation for the scalar potential. Two-loop corrections modify the estimate as m_H^{min} = 150 \pm 3 GeV, so that higher-order corrections of perturbation theory are completely under control, though they are numerically important in respect of experimental searches.

Source: http://arxiv.org/abs/1101.3406v1

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Sep 23, 2013
09/13

by
V. V. Kiselev; V. V. Shakirov

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In accordance with known phenomenological facts on leptons and quarks in the Standard Model as well as on the scale of neutrino masses and introducing the supersymmetry, we logically substantiate the unique composition of fundamental representation for the fermionic multiplet of gauge group $E_8$.

Source: http://arxiv.org/abs/1105.3013v3

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Jun 30, 2018
06/18

by
Ja. V. Balitsky; V. V. Kiselev

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The exact symmetry induced by the global shift of energy scale for the cosmological constant in the action of matter fields is spontaneously broken by setting the density of real vacuum energy and explicitly broken by the gravity that means the existence of Nambu--Goldstone boson, which transforms into the pseudo-Goldstone boson due to the gravity. We identify this boson with the inflaton in the Einstein frame of action for the fields, while the breaking is induced by a non-minimal interaction...

Topic: General Relativity and Quantum Cosmology

Source: http://arxiv.org/abs/1410.2528